如何从数据库中获取值并使用jsp在同一数据库中的另一个表中发布相同的值

Question

**Below is my code in my jsp file**

<table class="table" style="width:30%;">
        <tr > <td>
        <div class="dropdown">
  <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-expanded="true">
    Select product
    <span class="caret"></span>
  </button>
  <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
  <% for(RecipieProductAllergen app1:RecipieProductAllergen) {
     %>
    <li role="presentation"><a name="ProdID" role="menuitem" tabindex="-1" 

<c:url value="recipie.jsp" var="displayURL">
  <c:param name="ProdID"   value="${param.Name}" />

</c:url>
><%= app1.getProdID() %><%= app1.getProdName() %></a></li>

    <%}%>
  </ul>
</div></td>


        </tr>
</table>

下面是我使用的SQL查询...当我点击我的jsp网页上的下拉列表，并从列表中选择一个产品时，必须获取该产品的ID并在另一个表中更新相同的数据库请帮我解决此问题。

 public void selectProductsString(RecipieColumns2 rc2) throws SQLException {

        String sql1 = "select Products from [09RE]where RecName='Roasted Turkey Sandwich' and UU='uma'";
        Connection connection = getConnection();
        StringBuilder builder = new StringBuilder();
                try{
                    PreparedStatement statement = connection.prepareStatement(sql1);

                    ResultSet results = statement.executeQuery();
                    while(results.next()){
                        String Products = results.getString("Products");
                        String Product_list[] = Products.split(",");


                        String sql = "select id from [09PR] where ProdName=? and UU='uma'";
                        PreparedStatement statement1 = connection.prepareStatement(sql);
                        //statement1.setString(1, rc2.getProdName());
                        ResultSet results1 = statement1.executeQuery();
                        while(results1.next()){
                            String displaysql = sql;
                            String id = results1.getString("id");   
                                builder.append(Products+","+id);
                                String totalProducts = builder.toString();
                                String sql2 = "update [09RE] set Products ='" + totalProducts +"' where UU='uma'";
                                PreparedStatement statement2 = connection.prepareStatement(sql2);

                                statement2.executeQuery();
                            }
                    }


                    }catch (SQLException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } finally {
                        closeConnection(connection);
                    }

        }

由于